Azure Virtual Network Manager – Deep Dive

Last Updated on August 3, 2025 by Arnav Sharma

In cloud computing, managing networks can present a significant challenge. Organizations must grapple with scalability, security, connectivity across distributed environments, and maintaining consistency amidst a sprawling network infrastructure. Manual configuration becomes time-consuming and prone to errors as the number of virtual networks increases.

Azure Virtual Network Manager (AVNM) addresses these complexities by providing a centralized platform to administer and control your Azure virtual networks. AVNM allows you to design complex network topologies, establish seamless connectivity across regions, enforce robust security policies, and push consistent configurations throughout your Azure environment.

A well-architected and efficiently managed network is a cornerstone of successful Azure deployments. Effective network management in Azure facilitates:

• Secure Connectivity: Protect your sensitive data and workloads by implementing network segmentation, access controls, and threat detection mechanisms.
• Optimal Performance: Ensure applications perform reliably via load balancing, traffic optimization, and minimizing network latency.
• Scalability: Accommodate growth and changing business demands without network bottlenecks.
• Operational Agility: Respond quickly to new requirements or incidents, reducing downtime and maintaining business continuity.

What is Azure Virtual Network Manager?

Azure Virtual Network Manager (AVNM) is a core Azure service that streamlines the management and control of multiple virtual networks at scale. It provides a centralized platform to design, deploy, and govern complex network topologies across various Azure subscriptions and regions.

Primary Functions:

• Topology Creation: Easily create hub-and-spoke or mesh network architectures, simplifying connectivity between virtual networks.
• Global Connectivity Management: Establish and manage seamless communication between virtual networks, even when distributed across geographically diverse Azure regions.
• Security Policy Enforcement: Define and implement organization-wide security rules to maintain a consistent security posture throughout your Azure environment.
• Configuration Distribution: Apply and modify network configurations across multiple virtual networks simultaneously, saving time and reducing errors.

The Evolution of Network Management Tools in Azure Leading Up to AVNM

• Early Stages: Initially, managing Azure virtual networks was primarily a manual process. Administrators relied on the Azure portal or tools like PowerShell and Azure CLI to configure individual virtual networks, address routing, peering, and security.
• The Rise of Azure Resource Manager (ARM) Templates: ARM templates introduced a level of automation and repeatability, allowing the definition and deployment of network resources as code. However, managing large-scale deployments across subscriptions remained cumbersome.
• Emergence of Azure Virtual Network Manager: AVNM addresses the limitations of previous approaches by providing a centralized control plane. It simplifies complex networking scenarios and offers greater scalability for expanding Azure environments.

Key Features and Capabilities of AVNM

• Network Groups: Logically group virtual networks based on criteria such as their environment type (development, testing, production) or geographical location.
• Connectivity Configurations: Design hub-and-spoke or mesh topologies to tailor communication flows to your specific needs.
• Security Admin Rules: Enforce organization-level security policies. Even if local virtual network settings conflict, these admin rules ensure a consistent security baseline.
• Configuration Management: Create and centrally manage network configurations. Efficiently deploy these configurations across designated network groups.

Core Components of Azure Virtual Network Manager

• Network Groups
  • Network groups are logical collections of virtual networks that share common characteristics or requirements. They simplify the application of configurations and security policies at scale.
  • Types:
    • Static: You explicitly add and remove virtual networks from the group.
    • Dynamic: Membership is determined by conditions (e.g., virtual network name, tags, location). As virtual networks evolve, they automatically match the criteria and become part of (or removed from) the group.
  • How they are Used: Network groups streamline the application of connectivity configurations and security policies. Instead of managing individual virtual networks, you target a specific group for a desired configuration.
• Configuration and Deployment
  • Define the settings and rules that govern the behavior of your network, including routing, security, and topology (e.g., hub-and-spoke, mesh).
  • AVNM offers central management and enforcement of security policies through security admin configurations. It provides granular control over traffic flows and network access.
  • After creating configurations, you deploy them to selected network groups. AVNM automates the process, ensuring consistent application across your virtual networks.
• Connectivity Features
  • Hub-and-Spoke: Centralize connectivity and security services in a “hub” virtual network. Multiple “spoke” virtual networks connect to the hub, optimizing traffic flows and providing easier network management.
  • Mesh: Enables direct communication between any virtual network within the mesh. Ideal for scenarios requiring peer-to-peer communication.
  • Custom Connectivity Models: Flexibility to design complex topologies with various interconnected elements to suit your specific needs.
• Security and Compliance
  • Security Policies: Create and manage security admin configurations.
  • Rules: These rules define allowed or denied traffic within your virtual networks based on source, destination, port, and protocol.
  • Compliance Features: AVNM helps maintain a secure network, contributing to compliance with various security standards and regulations..

Deploy Azure Virtual Network Manager

Step-by-Step Guide

1. Create an AVNM instance:
   • In the Azure portal, locate “Virtual Network Manager” and select “Create.”
   • Configure basic details:
     • Subscription
     • Resource Group
     • Region
     • Name for your instance
2. Define Scope:
   • Choose management groups or individual subscriptions that AVNM will manage. Best practice is to use management groups for hierarchical organization.
3. Create Network Groups:
   • Designate network groups (static or dynamic) to logically organize your virtual networks.
4. Establish Configurations:
   • Create connectivity configurations (hub and spoke, mesh, etc.) based on your network design.
   • Define security admin configurations to enforce network-wide policies.
5. Deploy Configurations:
   • Associate the created configurations with your desired network groups. AVNM will push the configurations to the relevant virtual networks.

Tips for Initial Configuration and Network Group Setup:

• Planning is Key: Design your network topology and define the hierarchy (management groups, network groups) before deploying AVNM.
• Start Small: Begin with a smaller scope and test your configurations before expanding.
• Dynamic Groups: Leverage dynamic network groups to streamline management and automatically accommodate new virtual networks.
• Use Descriptive Naming: Choose meaningful names for your AVNM instance, network groups, and configurations to enhance maintainability.

Common Pitfalls to Avoid During Setup

• Overly Complex Topology: Avoid creating overly complicated network designs, start simple and iterate as your needs change.
• Incorrect Scope: Double-check the subscriptions and management groups within your AVNM scope to ensure it aligns with your intended management plan.
• Conflicting Rules: Check potential conflicts when defining security rules, as they can lead to unexpected network behavior.
• Insufficient Testing: Validate your network configurations in a non-production environment before deploying them widely.

Additional Considerations

• Permissions: Ensure you have the necessary permissions on subscriptions and resources within the AVNM scope.
• Documentation: Maintain clear documentation of your network topology, configurations, and AVNM settings to simplify troubleshooting and handovers.

Advanced Features and Best Practices

• Advanced Routing and Peering Capabilities
  • Custom Routing: Utilize custom routes in AVNM configurations to override default routing behavior, allowing you to optimize traffic flows based on specific requirements.
  • BGP Support: For complex peering scenarios involving BGP (Border Gateway Protocol) routing, AVNM offers integration with Azure Virtual WAN. This integration enables BGP-based dynamic routing for seamless connectivity across multiple sites and branches.
  • Forced Tunneling: In hub-and-spoke topologies, configure forced tunneling to redirect all internet-bound traffic from spoke virtual networks through the hub. This enhances security and enables centralized network control.
• How to Leverage Network Insights and Analytics
  • Azure Monitor Integration: AVNM integrates with Azure Monitor for centralized monitoring, log collection, and analysis.
  • Network Performance Monitoring: Implement proactive network troubleshooting using metrics, logs, and alerts from Azure Monitor to identify bottlenecks, latency issues, and unexpected connectivity problems.
  • Visualization: Create custom dashboards in Azure Monitor to gain real-time visualizations of your complex AVNM topology, facilitating quick decision-making.
• Best Practices for Managing and Scaling Your Network with AVNM
  • Leverage Automation Where possible, automate the deployment and management of network configurations using tools like Azure CLI, PowerShell, or ARM templates. This ensures consistency and reduces the chances of manual errors.
  • Role-Based Access Control (RBAC) Implement fine-grained RBAC in Azure to manage and restrict access to AVNM resources, improving security and auditability.
  • Version Control for Configurations Consider storing your AVNM configurations in a version control system (e.g., Git). This allows you to track changes, rollback if necessary, and collaborate effectively.
  • Regularly Review Policies Periodically review and update security admin rules and network configurations as your requirements and network environments evolve.

Additional Considerations

• Cost Management: While AVNM provides scalability, keep an eye on associated costs, especially for large-scale deployments.
• High Availability: For mission-critical applications, consider designing your AVNM instance and associated network configurations for high availability to minimize downtime.